My neighbor gave these two little fish to my son out of her aquarium. Apparently her fish had babies but she doesn't know what kind they are. They look like black goldfish to me but they're only about 1/2" long.

I have an outdoor fish pond on the deck but I'm afraid if I put them in there the big goldfish would eat them. I also have a little vase/fishbowl with a peace lily in it that I used to have a beta in. Do you think the fish would be okay in that until they get a little bigger?